Question: Who is the mother of Elektra that is married to Agamemnon?
Paraphrase: Who is the mother of Elektra that's hitched to Agamemnon?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q131651 wdt:P25 ?answer . ?answer wdt:P26 wd:Q128176}
Answer: Clytemnestra